Automotive Service Excellence (ASE) Brakes Certification 2025 – 400 Free Practice Questions to Pass the Exam

A soft or spongy brake pedal is a clear indication of air in the brake lines. When air enters the hydraulic braking system, it can compress more than the brake fluid, leading to a reduction in the effectiveness of braking. As a result, when the brake pedal is pressed, it may feel less firm, allowing for a softer or more sponge-like response instead of the solid feedback expected during normal braking operations. This sensation can directly impact the driver's ability to control the vehicle's stopping distance effectively, making it vital to address the issue to ensure safety.

The other options do not relate directly to the presence of air in the brake lines. Steering wheel wobble typically indicates problems with the suspension, alignment, or tire balance. Increased fuel consumption is generally associated with engine performance or drivability issues, and brake lights staying on can result from a malfunctioning switch or other electrical issues rather than air in the brake system.